Hello,
my WPML license was expired and I bought a new license (multilingual blog). After registering the license key with the productive and staging sites, I have several problems:
1. I can't create or change News in WordPress any more. When I click on the title of a News, a white page appears. This is happening for both languages (English and German).
On top of the WordPress page I get the message: "WPML Update is incomplete" and that I'd have to update wpml-string-translation (see screenshot).
2. When I try to update wpml-string-translation, I don't get the "update" button for WPML String Translation in the WordPress Updates page (see screenshot). Instead there is the link "Register". When I click there I get the message "WPML is registered".
Since we limit 1 issue per ticket I would advise we concentrate on 2nd one, and once you update WPML check if the issue still happens with WPML plugins, since it could be not related.
2) Delete your website from WPML.org and unregister WPML plugins. Then reregister it with a new key. You should then be able to update the WPML String translation from shared screen.